Original 1st printing 2nd/final state (White Lake) version 24 x 36&5/8" (large format) concert poster for the Woodstock Music and Arts Fair Aquarian Exposition, held in White Lake, NY from 8/15-17.1969.
Art by Arnold Skolnick, image is featured in the Art of Rock book on page 257 (plate 3.1). This is the LARGE-format version.
Poster advertises performances by Joan Baez, Arlo Guthrie, Tim Hardin, Richie Havens, the Incredible String Band, Bert Sommer, Ravi Shankar, Sly & the Family Stone and Sweetwater (8/15), Canned Heat, Creedence Clearwater (Revival), the Grateful Dead, Jefferson Airplane, Santana, Quill, Keef Hartley, the Who, Janis Joplin and Mountain, (8/16), the Band, the Jeff Beck Group (*canceled), Joe Cocker (and the Grease Band), Blood, Sweat & Tears, Johnny Winter, Crosby, Stills & Nash (with an unadvertised appearance by Neil Young), Iron Butterfly (*canceled/stranded at the airport), Ten Years After and Jimi Hendrix (with Gypsies, Suns and Rainbows). Not listed on the poster (but did perform); Country Joe McDonald (with and without the Fish), the Paul Butterfield Blues Band, John Sebastian and Sha-Na-Na.
Medium-thin glossy stock poster is in decent/used (B/B-) condition; there is a thin diagonal bend in the upper right margin/corner (about 7" long, along with a fair amount of roll wear/creasing along the upper left margin, a series of small edge tears and surface pulls in the right center margin, a home-restored wedge-shaped patch-in/repair (about 2" long) and a number of tears along the bottom margin, a series of light surface scuffs, handling dings, tiny stress creases... you get the idea.
While this example may have a few conditionally-challenged areas, I have priced it accordingly- there's a relative bargain here for somebody!